JPH07155365A - Deodorant - Google Patents
DeodorantInfo
- Publication number
- JPH07155365A JPH07155365A JP5309185A JP30918593A JPH07155365A JP H07155365 A JPH07155365 A JP H07155365A JP 5309185 A JP5309185 A JP 5309185A JP 30918593 A JP30918593 A JP 30918593A JP H07155365 A JPH07155365 A JP H07155365A
- Authority
- JP
- Japan
- Prior art keywords
- zeolite
- deodorant
- noble metal
- alumina
- heating element
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000002781 deodorant agent Substances 0.000 title claims abstract description 40
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 97
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims abstract description 52
- 238000010438 heat treatment Methods 0.000 claims abstract description 52
- 239000010457 zeolite Substances 0.000 claims abstract description 52
- 229910021536 Zeolite Inorganic materials 0.000 claims abstract description 50
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 38
- 229910000510 noble metal Inorganic materials 0.000 claims abstract description 38
- 239000003054 catalyst Substances 0.000 claims abstract description 30
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 30
- 239000010453 quartz Substances 0.000 claims abstract description 29
- 239000011521 glass Substances 0.000 claims abstract description 10
- 238000000576 coating method Methods 0.000 claims description 31
- 239000011248 coating agent Substances 0.000 claims description 30
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 21
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 20
- 239000011247 coating layer Substances 0.000 claims description 20
- 239000011230 binding agent Substances 0.000 claims description 14
- 238000001179 sorption measurement Methods 0.000 abstract description 15
- 239000002253 acid Substances 0.000 abstract description 13
- 239000000463 material Substances 0.000 abstract description 9
- 230000003647 oxidation Effects 0.000 abstract description 6
- 238000007254 oxidation reaction Methods 0.000 abstract description 6
- 238000004332 deodorization Methods 0.000 abstract description 4
- 238000000354 decomposition reaction Methods 0.000 abstract description 3
- 235000012239 silicon dioxide Nutrition 0.000 abstract 2
- 238000006555 catalytic reaction Methods 0.000 abstract 1
- 229910052681 coesite Inorganic materials 0.000 abstract 1
- 229910052593 corundum Inorganic materials 0.000 abstract 1
- 229910052906 cristobalite Inorganic materials 0.000 abstract 1
- 229910052682 stishovite Inorganic materials 0.000 abstract 1
- 229910052905 tridymite Inorganic materials 0.000 abstract 1
- 229910001845 yogo sapphire Inorganic materials 0.000 abstract 1
- 239000002002 slurry Substances 0.000 description 34
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 30
- WQOXQRCZOLPYPM-UHFFFAOYSA-N dimethyl disulfide Chemical compound CSSC WQOXQRCZOLPYPM-UHFFFAOYSA-N 0.000 description 30
- LSDPWZHWYPCBBB-UHFFFAOYSA-N Methanethiol Chemical compound SC LSDPWZHWYPCBBB-UHFFFAOYSA-N 0.000 description 29
- 238000012360 testing method Methods 0.000 description 21
- 238000000746 purification Methods 0.000 description 16
- 239000000126 substance Substances 0.000 description 16
- 230000001877 deodorizing effect Effects 0.000 description 15
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Substances [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 14
- IKHGUXGNUITLKF-UHFFFAOYSA-N Acetaldehyde Chemical compound CC=O IKHGUXGNUITLKF-UHFFFAOYSA-N 0.000 description 12
- 238000000034 method Methods 0.000 description 12
- 239000007864 aqueous solution Substances 0.000 description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 10
- 239000008119 colloidal silica Substances 0.000 description 9
- 230000000694 effects Effects 0.000 description 9
- 238000006864 oxidative decomposition reaction Methods 0.000 description 9
- 239000010970 precious metal Substances 0.000 description 8
- 239000003463 adsorbent Substances 0.000 description 7
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 6
- QVQLCTNNEUAWMS-UHFFFAOYSA-N barium oxide Chemical compound [Ba]=O QVQLCTNNEUAWMS-UHFFFAOYSA-N 0.000 description 6
- 229910001120 nichrome Inorganic materials 0.000 description 6
- 239000003570 air Substances 0.000 description 5
- 229910000420 cerium oxide Inorganic materials 0.000 description 5
- 238000002474 experimental method Methods 0.000 description 5
- 239000012212 insulator Substances 0.000 description 5
- BMMGVYCKOGBVEV-UHFFFAOYSA-N oxo(oxoceriooxy)cerium Chemical compound [Ce]=O.O=[Ce]=O BMMGVYCKOGBVEV-UHFFFAOYSA-N 0.000 description 5
- 229910052697 platinum Inorganic materials 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 229910052680 mordenite Inorganic materials 0.000 description 4
- 229910052763 palladium Inorganic materials 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- 230000035939 shock Effects 0.000 description 4
- 230000003197 catalytic effect Effects 0.000 description 3
- 238000010304 firing Methods 0.000 description 3
- 229910052809 inorganic oxide Inorganic materials 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 230000008929 regeneration Effects 0.000 description 3
- 238000011069 regeneration method Methods 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- AYJRCSIUFZENHW-UHFFFAOYSA-L barium carbonate Chemical compound [Ba+2].[O-]C([O-])=O AYJRCSIUFZENHW-UHFFFAOYSA-L 0.000 description 2
- 239000006227 byproduct Substances 0.000 description 2
- 150000001768 cations Chemical class 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000004817 gas chromatography Methods 0.000 description 2
- 238000011068 loading method Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000008188 pellet Substances 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 238000010298 pulverizing process Methods 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- -1 thiol compounds Chemical class 0.000 description 2
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 239000004113 Sepiolite Substances 0.000 description 1
- IKHGUXGNUITLKF-XPULMUKRSA-N acetaldehyde Chemical compound [14CH]([14CH3])=O IKHGUXGNUITLKF-XPULMUKRSA-N 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- 150000001299 aldehydes Chemical class 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000012080 ambient air Substances 0.000 description 1
- 239000000440 bentonite Substances 0.000 description 1
- 229910000278 bentonite Inorganic materials 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000010411 cooking Methods 0.000 description 1
- 238000005238 degreasing Methods 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000003618 dip coating Methods 0.000 description 1
- 150000002019 disulfides Chemical class 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000009503 electrostatic coating Methods 0.000 description 1
- 229910052675 erionite Inorganic materials 0.000 description 1
- 239000003205 fragrance Substances 0.000 description 1
- 229910052733 gallium Inorganic materials 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- PAZHGORSDKKUPI-UHFFFAOYSA-N lithium metasilicate Chemical compound [Li+].[Li+].[O-][Si]([O-])=O PAZHGORSDKKUPI-UHFFFAOYSA-N 0.000 description 1
- 229910052912 lithium silicate Inorganic materials 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000004745 nonwoven fabric Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- CLSUSRZJUQMOHH-UHFFFAOYSA-L platinum dichloride Chemical compound Cl[Pt]Cl CLSUSRZJUQMOHH-UHFFFAOYSA-L 0.000 description 1
- 235000019353 potassium silicate Nutrition 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 229910052703 rhodium Inorganic materials 0.000 description 1
- 238000007788 roughening Methods 0.000 description 1
- 238000007650 screen-printing Methods 0.000 description 1
- 229910052624 sepiolite Inorganic materials 0.000 description 1
- 235000019355 sepiolite Nutrition 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000010257 thawing Methods 0.000 description 1
- 229910001428 transition metal ion Inorganic materials 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000003643 water by type Substances 0.000 description 1
- 230000004580 weight loss Effects 0.000 description 1
Landscapes
- Treating Waste Gases (AREA)
- Catalysts (AREA)
- Disinfection, Sterilisation Or Deodorisation Of Air (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、暖房、給湯、乾燥、調
理、冷蔵、空調用機器等において利用される脱臭体およ
び脱臭作用を有する発熱体に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deodorizing element and a heating element having a deodorizing effect which are used in heating, hot water supply, drying, cooking, refrigerating, air conditioning equipment and the like.
【０００２】[0002]
【従来の技術】従来、活性炭やゼオライトなどの吸着剤
を脱臭器内に配置して、ガス状の悪臭物質を吸着して脱
臭する方法が主に用いられてきた。また、オゾン発生機
能を持たせた機器を室内に配置して、悪臭成分をオゾン
ガスによって酸化分解する方式や、貴金属などの酸化分
解触媒を火炎、発熱体などの熱源近傍に設けることによ
り触媒を加熱、活性化させ、臭気物質を酸化分解するこ
とにより脱臭を行う方式も採用されている。さらに近
年、ゼオライト、セピオライトなどの無機物系吸着剤と
貴金属などの酸化分解触媒を有する脱臭体を発熱体など
の熱源近傍に設置し、発熱体に通電されていないときに
は吸着剤により臭気物質を吸着することにより脱臭を行
い、発熱体通電時には触媒が加熱、活性化され、脱臭体
に接触した臭気物質の酸化分解を行うと同時に、吸着剤
に吸着した臭気物質を酸化分解し吸着剤の再生を行う方
式も行われている。2. Description of the Related Art Conventionally, a method has been mainly used in which an adsorbent such as activated carbon or zeolite is placed in a deodorizer to adsorb a gaseous odorous substance and deodorize it. In addition, a device equipped with an ozone generation function is placed in the room to oxidize and decompose odorous components with ozone gas, or an oxidative decomposition catalyst such as precious metal is installed near the heat source such as a flame or heating element to heat the catalyst. The method of deodorizing by activating and oxidizing and decomposing odorous substances is also adopted. Furthermore, in recent years, a deodorizer having an inorganic adsorbent such as zeolite and sepiolite and an oxidative decomposition catalyst such as a noble metal is installed near a heat source such as a heating element, and the odorant is adsorbed by the adsorbent when the heating element is not energized. Deodorizes by doing so, and when the heating element is energized, the catalyst is heated and activated, and oxidative decomposition of the odorous substance in contact with the deodorant is performed, and at the same time, the odorous substance adsorbed on the adsorbent is oxidized and decomposed to regenerate the adsorbent. The method is also used.
【０００３】[0003]
【発明が解決しようとする課題】しかし、このような従
来の脱臭法には、以下に示すような課題があった。従来
の活性炭やゼオライトのように、臭気物質の吸着により
脱臭を行う方式では、吸着が飽和に達すると交換が必要
である。また、触媒により脱臭を行う方式では、触媒を
常に加熱しなければ、脱臭ができない。さらに、オゾン
による臭気分解法では、脱臭に最適なオゾン発生濃度を
制御するために特別な装置を備えなければならない。ま
た、オゾンによって分解が困難な臭気成分種があるし、
オゾン発生器に寿命があるなどが問題点としてある。However, such a conventional deodorizing method has the following problems. In the conventional method of deodorizing by adsorbing odorous substances, such as activated carbon and zeolite, replacement is necessary when adsorption reaches saturation. Further, in the method of deodorizing with a catalyst, deodorization cannot be performed unless the catalyst is constantly heated. Further, in the odor decomposition method using ozone, a special device must be provided in order to control the optimum ozone generation concentration for deodorization. Also, there are odorous component species that are difficult to decompose by ozone,
The problem is that the ozone generator has a limited life.
【０００４】また、無機物系吸着剤と酸化分解触媒を有
する脱臭体により脱臭を行う方式では、ＳｉＯ2／Ａｌ2
Ｏ3比の低い通常のゼオライトでは、耐酸性が弱いため
限られた用途にしか適用できないといった問題点があ
る。また、メチルメルカプタンなどのチオール化合物
は、貴金属などの酸化分解触媒により効果的に除去され
るものの、ＳｉＯ2／Ａｌ2Ｏ3比の低い通常のゼオライ
トを用いた場合、ジメチルジサルファイドなどのジサル
ファイドが生成し易いといった問題点も有していた。Further, in the method of deodorizing with a deodorant having an inorganic adsorbent and an oxidative decomposition catalyst, SiO 2 / Al 2
Ordinary zeolite having a low O 3 ratio has a problem that it can be applied only to a limited number of applications because of its weak acid resistance. Further, thiol compounds such as methyl mercaptan are effectively removed by oxidative decomposition catalysts such as precious metals, but when ordinary zeolite having a low SiO 2 / Al 2 O 3 ratio is used, disulfides such as dimethyldisulfide are used. It also had a problem that was easily generated.
【０００５】[0005]
【課題を解決するための手段】本発明は、モル比ＳｉＯ
2／Ａｌ2Ｏ3が８以上のゼオライト、アルミナおよび貴
金属を含む脱臭体である。ここに吸着剤として用いられ
るゼオライトは、ＷmＺnＯ2n・ｓＨ2Ｏで表わされる含
水ケイ酸塩であり、Ｗは交換可能な金属カチオン、Ｚは
ＳｉとＡｌである。 また、本発明の脱臭体は、前記の
ゼオライト、および貴金属を担持したアルミナを含む構
成である。The present invention is directed to a molar ratio SiO
2 / Al 2 O 3 is a deodorant body containing 8 or more zeolite, alumina and a noble metal. Zeolite used as an adsorbent here is W m Z n O 2n · sH hydrous silicate represented by 2 O, W is exchangeable metal cations, Z is Si and Al. Further, the deodorant body of the present invention is configured to include the above-mentioned zeolite and alumina supporting a noble metal.
【０００６】さらに、他の態様において、本発明の脱臭
体は、前記のゼオライトとアルミナを含む成型体もしく
は被膜の外表面ないし外表面近傍に貴金属を偏在させた
構成を有する。Further, in another embodiment, the deodorant body of the present invention has a structure in which a noble metal is unevenly distributed on the outer surface or near the outer surface of the molded body or coating containing zeolite and alumina.
【０００７】本発明の発熱体は、電器抵抗体を内蔵する
石英またはガラス体と、前記石英またはガラス体の表面
に形成された触媒被覆層を具備し、前記触媒被覆層が上
記のゼオライト、アルミナ、無機バインダーおよび貴金
属を含んでいる。ここで、触媒被覆層の貴金属触媒は、
触媒を含まない被覆層を形成し、これに触媒を添加する
か、被覆層を形成するアルミナにあらかじめ触媒を担持
させておくのが好ましい。The heating element of the present invention comprises a quartz or glass body containing an electric resistor and a catalyst coating layer formed on the surface of the quartz or glass body, and the catalyst coating layer is the above-mentioned zeolite or alumina. , Containing an inorganic binder and a precious metal. Here, the noble metal catalyst of the catalyst coating layer is
It is preferable to form a coating layer containing no catalyst and add the catalyst to the coating layer, or carry the catalyst on the alumina forming the coating layer in advance.
【０００８】また、無機バインダーは、シリカであるこ
とが好ましく、前記触媒被覆層のバインダーとしてのシ
リカ含有割合は１０〜４０ｗｔ％が適当である。このバ
インダーは、上記脱臭体におけるゼオライトとアルミナ
を含む成型体もしくは被膜を作製するためのバインダー
としても適用される。The inorganic binder is preferably silica, and the content of silica as a binder in the catalyst coating layer is suitably 10 to 40 wt%. This binder is also applied as a binder for producing a molded body or coating containing zeolite and alumina in the deodorant body.
【０００９】[0009]
【作用】本発明の脱臭体にはゼオライトが含まれている
ために、周囲の空気を脱臭体に接触させることにより、
悪臭成分がゼオライトに吸着され、脱臭体を加熱するこ
となく、脱臭を行うことができる。さらに、通常は上記
の方法で脱臭を行い、ゼオライトの吸着能が飽和に達し
た時点で、脱臭体を加熱することにより、触媒物質であ
る貴金属を活性化し、脱臭体に接触した臭気物質を脱臭
するとともに、ゼオライトに吸着された臭気物質を酸化
分解し、ゼオライトの吸着能力を再生することも可能で
ある。この結果、長期間にわたり脱臭能力を維持するこ
とができる。[Function] Since the deodorant body of the present invention contains zeolite, by bringing ambient air into contact with the deodorant body,
The malodorous component is adsorbed by the zeolite, and the deodorizing substance can be deodorized without heating the deodorizing substance. Further, usually, deodorization is performed by the above method, and when the adsorption capacity of the zeolite reaches saturation, the deodorant is heated to activate the precious metal that is the catalyst substance and deodorize the odorous substances that come into contact with the deodorant. At the same time, it is possible to oxidize and decompose the odorous substance adsorbed on the zeolite to regenerate the adsorption capacity of the zeolite. As a result, the deodorizing ability can be maintained for a long period of time.
【００１０】ところで、冷蔵庫内の除霜用ヒータ近傍に
この脱臭体を置いた場合、通常熱交換器がヒータの上部
に存在する構造であるため、除霜時ないし除霜直後に熱
交換器に霜として付着していたデフロスト水が脱臭体に
かかる場合がある。冷蔵庫の使用状況にもよるが、これ
らのデフロスト水は一般に酸性で、ｐＨ４近くになるこ
ともある。ゼオライトは、ＳｉＯ2／Ａｌ2Ｏ3比が大き
いほど耐酸性に優れている。ＳｉＯ2／Ａｌ2Ｏ3＝８よ
りも小さいゼオライトを用いると、ｐＨ４程度の酸でゼ
オライト構造が破壊され、脱臭特性が劣化するといった
問題が生じる。このようにＳｉＯ2／Ａｌ2Ｏ3比の大き
いゼオライトを用いることにより、脱臭体の適用用途が
広がる。By the way, when the deodorizer is placed in the vicinity of the defrosting heater in the refrigerator, the heat exchanger is usually located above the heater. Defrost water that has adhered as frost may splash on the deodorant body. Depending on how the refrigerator is used, these defrost waters are generally acidic and may have a pH of around 4. The larger the SiO 2 / Al 2 O 3 ratio, the more excellent the zeolite is in acid resistance. When a zeolite having a size smaller than SiO 2 / Al 2 O 3 = 8 is used, there is a problem that the zeolite structure is destroyed by an acid having a pH of about 4 and the deodorizing property is deteriorated. By using the zeolite having a large SiO 2 / Al 2 O 3 ratio in this way, the application of the deodorant is expanded.
【００１１】また、臭気物質がメチルメルカプタンであ
る場合、通常のＨ型、Ｎａ型ゼオライト単独で貴金属を
含まない脱臭体では、ＳｉＯ2／Ａｌ2Ｏ3＝８以上のゼ
オライトを用いても、十分にメチルメルカプタンを低減
させることができない。イオン交換サイトにＣｕなどの
遷移金属イオンが入ったゼオライトでは、メチルメルカ
プタンを効果的に低減させることが可能であるが、ジメ
チルジサルファイドが生成し易いといった問題点を有し
ている。さらに、ゼオライトを含まず表面に貴金属を担
持したアルミナ単独を脱臭体として用いた場合でも、Ｃ
ｕイオン交換ゼオライトと同様の問題が生じる。しか
し、ＳｉＯ2／Ａｌ2Ｏ3比の大きいハイシリカゼオライ
トと無機酸化物と貴金属を複合させた脱臭体を用いる
と、効果的にメチルメルカプタンを低減することがで
き、さらにジメチルジサルファイドの発生も抑制でき
る。これは、ＳｉＯ2／Ａｌ2Ｏ3比の大きいハイシリカ
ゼオライトは、ジメチルジサルファイドの吸着特性に優
れているためであると考えられる。When the odorous substance is methyl mercaptan, in the case of a normal deodorant containing H-type and Na-type zeolite alone and containing no precious metal, it is sufficient to use a zeolite having SiO 2 / Al 2 O 3 = 8 or more. Can not reduce methyl mercaptan. Zeolite containing a transition metal ion such as Cu in the ion exchange site can effectively reduce methyl mercaptan, but has a problem that dimethyldisulfide is easily generated. Furthermore, even when alumina alone, which does not contain zeolite and carries a noble metal on the surface, is used as a deodorant, C
Problems similar to u ion-exchanged zeolites occur. However, by using a high-silica zeolite having a large SiO 2 / Al 2 O 3 ratio, a deodorant compounding an inorganic oxide and a noble metal, it is possible to effectively reduce methyl mercaptan and also to generate dimethyl disulfide. Can be suppressed. It is considered that this is because the high silica zeolite having a large SiO 2 / Al 2 O 3 ratio has excellent dimethyldisulfide adsorption characteristics.
【００１２】さらに、ＳｉＯ2／Ａｌ2Ｏ3比が大きいほ
ど空気中の水分を吸着しにくく、水分の吸着による脱臭
能の低下が抑制されるといった効果や、ゼオライトの耐
熱性が向上するといった効果も期待される。また、貴金
属の担持状態に関しては、ゼオライトに担持された場合
やシリカなどアルミナ以外の無機酸化物に担持されてい
る場合に比べて、貴金属がアルミナの上に高分散で担持
されている場合の方が、優れた耐熱性を得ることができ
る。なお、アセトアルデヒドなどのアルデヒドの臭気に
対しては、貴金属が脱臭に効果的であり、特にＰｔの特
性が高い。また、貴金属担持量が多いほど浄化特性が高
く、また同じ貴金属担持量では脱臭体の外表面ないし外
表面近傍に貴金属が偏在する方が浄化特性が高い。Further, the larger the SiO 2 / Al 2 O 3 ratio is, the more difficult it is to adsorb moisture in the air, the effect of suppressing the decrease in deodorizing ability due to the adsorption of moisture, and the effect of improving the heat resistance of zeolite. Is also expected. Regarding the supported state of the noble metal, the case where the noble metal is supported on the alumina in a highly dispersed state as compared with the case where it is supported on zeolite or the case where it is supported on an inorganic oxide other than alumina such as silica. However, excellent heat resistance can be obtained. Note that the noble metal is effective in deodorizing the odor of aldehydes such as acetaldehyde, and the characteristics of Pt are particularly high. Further, the larger the amount of carried noble metal is, the higher the purification property is. Also, when the amount of carried noble metal is the same, the purification property is higher when the noble metal is unevenly distributed on or near the outer surface of the deodorizer.
【００１３】さらに、脱臭体を発熱体の基材に塗布し被
覆層として使用することにより、発熱体の熱が効率的に
脱臭体に伝わり、貴金属の酸化分解能を十分に発揮させ
ることができる。また、発熱体の基材としては、被覆層
の密着性の点で石英やガラスが最適である。この場合、
無機バインダーとして、シリカが最も優れている。シリ
カを用いることにより、触媒特性を低下させることな
く、基材から剥離しにくい被膜を形成することができ
る。シリカの含有割合は、被覆層中に１０〜４０ｗｔ％
であることが望ましい。シリカの含有割合が４０ｗｔ％
を超えると、被膜に亀裂が入りやすくなり、密着性低下
を招き易い。また、１０ｗｔ％未満では、シリカの十分
な密着性が得られない。Furthermore, by applying the deodorant to the base material of the heating element and using it as a coating layer, the heat of the heating element can be efficiently transmitted to the deodorizing element, and the oxidation decomposition ability of the noble metal can be sufficiently exhibited. Further, as the base material of the heating element, quartz and glass are optimal in terms of the adhesiveness of the coating layer. in this case,
Silica is the most excellent inorganic binder. By using silica, it is possible to form a coating that is difficult to peel from the base material without deteriorating the catalytic properties. Silica content is 10-40 wt% in the coating layer
Is desirable. Silica content is 40wt%
When it exceeds, the coating film is likely to be cracked, and the adhesion is likely to be deteriorated. Further, if it is less than 10 wt%, sufficient adhesion of silica cannot be obtained.
【００１４】[0014]
【実施例】以下に、本発明に用いる好ましい材料につい
て説明する。ゼオライトは、Ｈ型、Ｎａ型、Ｋ型など種
々の交換カチオンを持ったゼオライトを用いることがで
きる。また、ゼオライト骨格中に存在するＡｌをＧａや
Ｔｉなどで置換したものを用いてもよい。この場合、置
換原子をＭとすると、モル比Ｓｉ／Ｍ＝４以上であれば
Ａｌの場合と同様の効果が期待できる。アルミナは、β
−、γ−、δ−、θ−、η−、ρ−、χ−アルミナなど
の準安定アルミナである。アルミナへの貴金属の担持
は、あらかじめ貴金属をアルミナに担持しておいてもよ
いが、アルミナとゼオライトを混合してから貴金属水溶
液に含浸したり、前記混合物に貴金属水溶液を滴下した
後、焼成し貴金属を担持してもよい。これは、ゼオライ
ト上に担持される貴金属もあるが、アルミナ上に担持さ
れた貴金属もあるため耐熱性は維持されるからである。The preferred materials used in the present invention will be described below. As the zeolite, zeolite having various exchange cations such as H type, Na type and K type can be used. Alternatively, Al existing in the zeolite skeleton may be replaced with Ga or Ti. In this case, if the substitutional atom is M, the same effect as in the case of Al can be expected if the molar ratio Si / M = 4 or more. Alumina is β
Metastable alumina such as −, γ−, δ−, θ−, η−, ρ−, χ− alumina. The loading of the noble metal on the alumina may be performed by loading the noble metal on the alumina in advance.However, the alumina and the zeolite are mixed and then impregnated in the aqueous solution of the noble metal, or the aqueous solution of the noble metal is dropped into the mixture, and then the precious metal is baked. May be carried. This is because some noble metals are supported on zeolite, but some noble metals are supported on alumina, so that heat resistance is maintained.
【００１５】本発明の脱臭体は、酸化セリウムを含むこ
とが望ましい。酸化セリウムを脱臭体中に含むことによ
り、脱臭体を加熱した場合、炭化水素化合物に対する酸
化分解活性を向上させることができる。酸化セリウム含
有割合は、脱臭体中に２〜１５ｗｔ％であることが望ま
しい。酸化セリウムの含有割合が１５ｗｔ％を超える
と、触媒の酸化分解特性が低下し始め、また２ｗｔ％未
満では、酸化セリウムの十分な添加効果が得られない。
本発明の脱臭体は、酸化バリウムを含むことが望まし
い。酸化バリウムを脱臭体中に含むことにより、触媒の
酸化分解特性を向上することができる。また、酸化バリ
ウムの代わりに炭酸バリウムを用いても同様の添加効果
が得られる。The deodorant product of the present invention preferably contains cerium oxide. By including cerium oxide in the deodorant body, when the deodorant body is heated, the oxidative decomposition activity with respect to the hydrocarbon compound can be improved. The content ratio of cerium oxide in the deodorant is preferably 2 to 15 wt%. When the content ratio of cerium oxide exceeds 15 wt%, the oxidative decomposition characteristics of the catalyst begin to deteriorate, and when it is less than 2 wt%, a sufficient addition effect of cerium oxide cannot be obtained.
The deodorant body of the present invention preferably contains barium oxide. By including barium oxide in the deodorant, the oxidative decomposition characteristics of the catalyst can be improved. Further, the same addition effect can be obtained by using barium carbonate instead of barium oxide.
【００１６】貴金属としては、ＰｔまたはＰｄを用いる
ことが望ましく、ＰｔとＰｄの両方を用いた場合さらに
望ましい。これは、ＰｔやＰｄの酸化分解力がＲｈやＩ
ｒに比べて高く、ＰｔとＰｄの両方を用いることにより
さらに高活性となるためである。また、Ｒｕを用いた場
合、高温での使用によりＲｕが揮散し有害物質となる。
また、被覆層を形成するとき、石英またはガラス体表面
を粗面化した後被覆層を設けるか、石英またはガラス体
表面を十分に脱脂した後被覆層を設けることが望まし
い。この製造方法により、石英またはガラス体と被覆層
との密着性を向上することができる。前記の被覆層形成
方法は、種々の方法を用いることができる。例えば、ス
プレー塗装、ディップ塗装、静電塗装、ロールコート
法、スクリーン印刷法などがある。It is desirable to use Pt or Pd as the noble metal, and it is more desirable to use both Pt and Pd. This is because the oxidative decomposition power of Pt and Pd is Rh and I.
This is because it is higher than r, and the activity becomes even higher by using both Pt and Pd. When Ru is used, Ru is volatilized and becomes a harmful substance when used at high temperature.
Further, when forming the coating layer, it is desirable to provide the coating layer after roughening the surface of the quartz or glass body, or to provide the coating layer after sufficiently degreasing the surface of the quartz or glass body. By this manufacturing method, the adhesion between the quartz or glass body and the coating layer can be improved. Various methods can be used as the method for forming the coating layer. For example, there are spray coating, dip coating, electrostatic coating, roll coating method, screen printing method and the like.
【００１７】本発明の脱臭体は、基材表面に被膜として
形成しても、ペレットに成型しても、また粉末として不
織布のようなものに包んで用いることもできる。ペレッ
ト等の成型体として用いる場合にも、無機バインダーと
してシリカを用いることにより、耐衝撃性に優れた成型
体を得ることができる。本発明の発熱体の代表的な実施
例を図１に示す。図１において、１はニクロム線、２は
石英管、３は触媒被覆層、４はニクロム線１を保持する
碍子である。以下に具体的な実施例を示す。The deodorant product of the present invention can be used as a film formed on the surface of a substrate, molded into pellets, or wrapped as a powder in a non-woven fabric. Even when used as a molded product such as pellets, by using silica as the inorganic binder, a molded product having excellent impact resistance can be obtained. A typical embodiment of the heating element of the present invention is shown in FIG. In FIG. 1, 1 is a nichrome wire, 2 is a quartz tube, 3 is a catalyst coating layer, and 4 is an insulator holding the nichrome wire 1. Specific examples will be shown below.
【００１８】［実施例１]塩化白金酸水溶液とアルミナ
をボールミルを用いて十分に混合した後、５００℃にて
焼成し、粉砕して、Ｐｔを担持したアルミナを調製し
た。このＰｔを担持したアルミナ１６０ｇと、シリカに
換算して２０ｗｔ％含むコロイダルシリカ水溶液４００
ｇと、水２００ｇおよびＳｉＯ2／Ａｌ2Ｏ3＝１５のＨ
−モルデナイト１６０ｇを、ボールミルを用いて十分に
混合して、スラリーＡを調製した。一方、外径１０ｍ
ｍ、内径９ｍｍ、長さ３４４ｍｍの石英管２の外周面を
脱脂洗浄した。スラリーＡを用いて、石英管２の両側３
３ｍｍを残して外周面にスプレ−法で塗装した後、１０
０℃で２時間乾燥し、続いて５００℃で１時間焼成して
触媒被膜３を有する石英管２を作製した。被膜重量は
１．０ｇであり、Ｐｔ含有量は、２５ｍｇである。この
石英管２に、４０Ωのコイル状ニクロム線１を内蔵さ
せ、碍子４により石英管２の両側で絶縁、保持し、触媒
被膜３を有する発熱体Ａを作成した。Example 1 An aqueous solution of chloroplatinic acid and alumina were thoroughly mixed by using a ball mill, followed by firing at 500 ° C. and pulverization to prepare Pt-supported alumina. An aqueous colloidal silica solution 400 containing 160 g of Pt-supported alumina and 20 wt% in terms of silica.
g, 200 g of water and H of SiO 2 / Al 2 O 3 = 15
-Slurry A was prepared by thoroughly mixing 160 g of mordenite using a ball mill. On the other hand, outer diameter 10m
The outer peripheral surface of the quartz tube 2 having a diameter of m, an inner diameter of 9 mm and a length of 344 mm was degreased and washed. Using the slurry A, both sides 3 of the quartz tube 2
After coating the outer peripheral surface with a spray method while leaving 3 mm, 10
It was dried at 0 ° C. for 2 hours and then baked at 500 ° C. for 1 hour to prepare a quartz tube 2 having a catalyst coating 3. The coating weight is 1.0 g and the Pt content is 25 mg. A 40 Ω coil-shaped nichrome wire 1 was built in this quartz tube 2 and insulated and held on both sides of the quartz tube 2 by insulators 4 to prepare a heating element A having a catalyst coating 3.
【００１９】種々のゼオライトを用い、ゼオライトの耐
酸性を調べるため以下の検討を行った。スラリーＡにお
いてＨ−モルデナイトの代わりに、ＳｉＯ2／Ａｌ2Ｏ3
比がそれぞれ２、５．５、７．５、８、１１のＮａイオ
ン交換Ａ型ゼオライト、Ｈ−Ｙ型ゼオライト、エリオナ
イト、オフレタイト、Ｈ−モルデナイトを用いスラリー
を調製し、石英管に被覆し発熱体Ｂ、Ｃ、Ｄ、Ｅ、Ｆを
作製した。この発熱体をｐＨ３．５の酢酸水溶液中に室
温で１週間浸漬した後、焼成し被膜の重量減を求め、ゼ
オライトの耐酸性を調べた。結果を表１に示した。耐酸
性に乏しいゼオライトは酸性溶液に溶解するが、表１に
示すように、ＳｉＯ2／Ａｌ2Ｏ3比が大きいほど耐酸性
に優れており、特にＳｉＯ2／Ａｌ2Ｏ3＝８以上で優れ
ていることがわかる。The following studies were conducted to investigate the acid resistance of zeolite using various zeolites. Instead of H-mordenite in Slurry A, SiO 2 / Al 2 O 3
A slurry was prepared using Na ion-exchanged A-type zeolite, HY-type zeolite, erionite, offretite, and H-mordenite with the ratios of 2, 5.5, 7.5, 8, and 11, respectively, and coated on a quartz tube. Heating elements B, C, D, E and F were produced. The heating element was immersed in an aqueous acetic acid solution having a pH of 3.5 for 1 week at room temperature and then baked to determine the weight loss of the coating film, and the acid resistance of the zeolite was examined. The results are shown in Table 1. Zeolite, which is poor in acid resistance, dissolves in an acid solution, but as shown in Table 1, the larger the SiO 2 / Al 2 O 3 ratio, the more excellent the acid resistance, especially when SiO 2 / Al 2 O 3 = 8 or more. It turns out to be excellent.
【００２０】[0020]
【表１】 [Table 1]
【００２１】［実施例２］メチルメルカプタン浄化特性
およびジメチルジサルファイド浄化特性と脱臭体構成成
分との関係を調べるため、以下の検討を行った。スラリ
ーＡにおいてＨ−モルデナイトのかわりに、シリカライ
トを用いスラリーＧを調製し、このスラリーを石英管に
被覆して発熱体Ｇを作製した。被膜重量、Ｐｔ含有量は
Ａと同じである。また、スラリーＡにおいて、Ｐｔの担
持量を半分にしたアルミナを調製し、Ｐｔ担持アルミナ
３２０ｇと、シリカに換算して２０ｗｔ％含むコロイダ
ルシリカ水溶液４００ｇと、水２００ｇを、ボールミル
を用いて十分に混合しスラリーＨを調製し、このスラリ
ーを石英管に被覆してゼオライトを含まない発熱体Ｈを
作製した。被膜重量、Ｐｔ含有量はＡと同じである。Example 2 In order to investigate the relationship between the methyl mercaptan purification characteristics and the dimethyl disulfide purification characteristics and the deodorant constituents, the following studies were carried out. In Slurry A, silicalite was used in place of H-mordenite to prepare Slurry G, and a quartz tube was coated with this slurry to prepare heating element G. The coating weight and Pt content are the same as A. Further, in the slurry A, alumina in which the amount of Pt supported was halved was prepared, and 320 g of Pt-supported alumina, 400 g of a colloidal silica aqueous solution containing 20 wt% as silica, and 200 g of water were sufficiently mixed using a ball mill. Then, a slurry H was prepared, and a quartz tube was coated with this slurry to prepare a heating element H containing no zeolite. The coating weight and Pt content are the same as A.
【００２２】一方、シリカライト３２０ｇと、シリカに
換算して２０ｗｔ％含むコロイダルシリカ水溶液４００
ｇと、水２００ｇを、ボールミルを用いて十分に混合し
て、スラリーＩを調製し、このスラリーを石英管に被覆
して貴金属とアルミナを含まない発熱体Ｉを作製した。
被膜重量はＡと同じである。さらに、スラリーＩにおい
てゼオライトとしてＳｉＯ2／Ａｌ2Ｏ3＝２のＮａイオ
ン交換Ａ型ゼオライトを用いてスラリーＪを調製し、こ
のスラリーを石英管に被覆して発熱体Ｊを作製した。被
膜重量はＡと同じである。次に、発熱体Ｇ、Ｈ、Ｉ、Ｊ
についてメチルメルカプタン浄化試験を行った。メチル
メルカプタン浄化試験は、２５０ｌの立方体のフッ素樹
脂製の容器の中に発熱体を置き、発熱体を加熱せず、濃
度が８ｐｐｍになるようにメチルメルカプタンを容器に
注入し、９０分後のメチルメルカプタン濃度とジメチル
ジサルファイド生成量を調べることにより行った。測定
はガスクロマトグラフにより調べた。結果を表２に示し
た。On the other hand, an aqueous colloidal silica solution 400 containing 320 g of silicalite and 20 wt% in terms of silica.
g and 200 g of water were sufficiently mixed using a ball mill to prepare a slurry I, and the slurry was coated on a quartz tube to produce a heating element I containing no precious metal and alumina.
The coating weight is the same as A. Further, in the slurry I, a Na ion-exchanged A-type zeolite of SiO 2 / Al 2 O 3 = 2 was used as a zeolite to prepare a slurry J, and a quartz tube was coated with this slurry to prepare a heating element J. The coating weight is the same as A. Next, the heating elements G, H, I, J
Was subjected to a methyl mercaptan purification test. In the methyl mercaptan purification test, a heating element was placed in a 250 l cubic container made of fluororesin, the heating element was not heated, and methyl mercaptan was injected into the container so that the concentration became 8 ppm, and 90 minutes later, methyl was prepared. It was carried out by examining the mercaptan concentration and the amount of dimethyldisulfide produced. The measurement was carried out by gas chromatography. The results are shown in Table 2.
【００２３】[0023]
【表２】 [Table 2]
【００２４】さらに、発熱体Ｇ、Ｈ、Ｉ、Ｊについてジ
メチルジサルファイド浄化試験を行った。メチルメルカ
プタン浄化試験と同様の実験方法により、ジメチルジサ
ルファイド初期濃度は５ｐｐｍになるようにジメチルジ
サルファイドを容器に注入し、９０分後の残存率を調べ
た。結果を表３に示した。Further, the heating elements G, H, I and J were subjected to a dimethyldisulfide purification test. By the same experimental method as the methyl mercaptan purification test, dimethyldisulfide was injected into the container so that the initial concentration of dimethyldisulfide was 5 ppm, and the residual rate after 90 minutes was examined. The results are shown in Table 3.
【００２５】[0025]
【表３】 [Table 3]
【００２６】表２、表３より明らかなように、貴金属担
持アルミナのみを脱臭体として用いると、メチルメルカ
プタンが効率的に除去されるが、ジメチルジサルファイ
ドが多量に副生する。また、シリカライトのみを用いる
と、ジメチルジサルファイドは生成しないものの、メチ
ルメルカプタンの浄化能に劣る。シリカライトと貴金属
担持アルミナの両方を含有させることにより、メチルメ
ルカプタンを効率的に除去できるとともに、ジメチルジ
サルファイドの発生を抑制することができる。これは、
シリカライトはＳｉＯ2／Ａｌ2Ｏ3比が著しく大きいこ
とによりジメチルジサルファイドを効果的に吸着するか
らであり、発熱体ＪのようにＳｉＯ2／Ａｌ2Ｏ3が小さ
いゼオライトでは、ジメチルジサルファイドを効果的に
吸着することができない。As is clear from Tables 2 and 3, when only noble metal-supported alumina is used as a deodorant, methyl mercaptan is efficiently removed, but a large amount of dimethyl disulfide is produced as a by-product. Further, when only silicalite is used, dimethyldisulfide is not produced, but the ability to purify methyl mercaptan is poor. By including both silicalite and noble metal-supported alumina, methyl mercaptan can be efficiently removed, and the generation of dimethyl disulfide can be suppressed. this is,
This is because silicalite effectively adsorbs dimethyldisulfide due to its remarkably large SiO 2 / Al 2 O 3 ratio, and in the case of a zeolite having a small SiO 2 / Al 2 O 3 like the heating element J, dimethyldisulfide is used. Cannot be effectively adsorbed.
【００２７】［実施例３］貴金属の担持状態とアセトア
ルデヒドの浄化特性の関係を調べるため、以下の実験を
行った。塩化白金酸水溶液とアルミナ１６０ｇと、シリ
カに換算して２０ｗｔ％含むコロイダルシリカ水溶液４
００ｇと、水２００ｇとシリカライト１６０ｇをボール
ミルを用いて十分に混合して、スラリーＫを調製し、こ
のスラリーを石英管に被覆して発熱体Ｋを作製した。被
膜重量、Ｐｔ含有量はＡと同じである。一方、スラリー
Ｇにおいて貴金属を担持しないアルミナを用い、スラリ
ーＬを調製し、このスラリーを石英管に被覆して貴金属
を含まない発熱体を作製した。被膜重量はＡと同じであ
る。この発熱体の被膜に塩化白金水溶液をスポイトにて
均一に滴下した後焼成し、被膜外表面に白金を担持した
発熱体Ｌを作製した。Ｐｔ含有量はＡと同じである。Example 3 The following experiment was conducted in order to investigate the relationship between the loaded state of noble metal and the purification property of acetaldehyde. A chloroplatinic acid aqueous solution, 160 g of alumina, and a colloidal silica aqueous solution containing 20 wt% in terms of silica 4
00 g, 200 g of water and 160 g of silicalite were thoroughly mixed using a ball mill to prepare a slurry K, and a quartz tube was coated with this slurry to prepare a heating element K. The coating weight and Pt content are the same as A. On the other hand, a slurry L was prepared by using alumina that does not support a noble metal in the slurry G, and a quartz tube was coated with this slurry to produce a heating element containing no noble metal. The coating weight is the same as A. An aqueous solution of platinum chloride was uniformly dropped on the coating of this heating element with a dropper and then fired to produce a heating element L carrying platinum on the outer surface of the coating. The Pt content is the same as A.
【００２８】発熱体Ｇ、Ｋ、Ｌについてアセトアルデヒ
ドの浄化特性を調べた。アセトアルデヒド浄化試験は、
２５０ｌの立方体のフッ素樹脂製の容器の中に発熱体を
置き、発熱体を加熱せず、濃度が１４ｐｐｍになるよう
にアセトアルデヒドを容器に注入し、６０分後のアセト
アルデヒド濃度をガスクロマトグラフにより調べた。結
果を表４に示した。表４に示すように、貴金属を被膜外
表面に担持することにより、アセトアルデヒド浄化能が
向上する。The purification characteristics of acetaldehyde were examined for the heating elements G, K and L. The acetaldehyde purification test
The heating element was placed in a 250 l cubic fluororesin container, the heating element was not heated, and acetaldehyde was injected into the container to a concentration of 14 ppm, and the acetaldehyde concentration after 60 minutes was examined by gas chromatography. . The results are shown in Table 4. As shown in Table 4, by supporting a noble metal on the outer surface of the coating, the acetaldehyde purification ability is improved.
【００２９】[0029]
【表４】 [Table 4]
【００３０】［実施例４］貴金属の担持状態と触媒の耐
熱性の関係を調べるため、種々の無機酸化物に貴金属を
担持し検討を行った。塩化白金酸水溶液とシリカライト
をボールミルを用いて十分に混合した後、５００℃にて
焼成し、粉砕して、Ｐｔを担持したシリカライトを調製
した。このＰｔを担持したシリカライト１６０ｇと、シ
リカに換算して２０ｗｔ％含むコロイダルシリカ水溶液
４００ｇと、水２００ｇおよびアルミナ１６０ｇを、ボ
ールミルを用いて十分に混合してスラリーＭを調製し、
このスラリーを石英管に被覆して貴金属をシリカライト
に担持した発熱体Ｍを作製した。被膜重量、Ｐｔ含有量
はＡと同じである。一方、スラリーＧにおいてアルミナ
の代わりに、シリカ、ジルコニアを用いてスラリーを調
製し、それぞれのスラリーを石英管に被覆して発熱体
Ｎ、Ｏを作製した。[Example 4] In order to investigate the relationship between the loaded state of noble metal and the heat resistance of the catalyst, various inorganic oxides were loaded with noble metal and examined. The chloroplatinic acid aqueous solution and silicalite were thoroughly mixed using a ball mill, followed by firing at 500 ° C. and pulverization to prepare Pt-supported silicalite. 160 g of this Pt-supported silicalite, 400 g of an aqueous colloidal silica solution containing 20 wt% in terms of silica, 200 g of water and 160 g of alumina were thoroughly mixed using a ball mill to prepare a slurry M,
A quartz tube was coated with this slurry to prepare a heating element M in which a noble metal was supported on silicalite. The coating weight and Pt content are the same as A. On the other hand, in the slurry G, instead of alumina, silica and zirconia were used to prepare slurries, and quartz tubes were coated with the respective slurries to produce heating elements N and O.
【００３１】これらの発熱体Ｇ、Ｍ、Ｎ、Ｏについて酢
酸酸化浄化試験を行った。酢酸酸化浄化試験は、２５０
ｌの立方体のフッ素樹脂製の容器の中に発熱体を置き、
発熱体の中心の外表面の温度が２５０℃となるよう加熱
したところへ、濃度が１５ｐｐｍになるように酢酸を容
器に注入し、１０分後の濃度を調べることにより行い、
このときの残存率を初期特性とした。測定後発熱体の碍
子、ニクロム線を外し、７５０℃で１０００時間空気中
で焼成した後、再び碍子、ニクロム線を装着し、酢酸酸
化浄化試験を行い、耐熱試験後の特性とした。結果を表
５に示した。表５に示すように、アルミナ上に貴金属を
担持した場合に最も高活性となり、さらに触媒の耐熱性
に優れていることがわかる。An acetic acid oxidation purification test was conducted on these heating elements G, M, N and O. The acetic acid oxidation purification test is 250
Place the heating element in the cubic fluororesin container of 1
To the place where the temperature of the outer surface of the center of the heating element was heated to 250 ° C., acetic acid was injected into the container so that the concentration became 15 ppm, and the concentration after 10 minutes was examined.
The residual rate at this time was taken as the initial characteristic. After the measurement, the insulator and the nichrome wire of the heating element were removed, and after firing in air at 750 ° C. for 1000 hours, the insulator and the nichrome wire were mounted again, and an acetic acid oxidation purification test was performed to obtain the characteristics after the heat resistance test. The results are shown in Table 5. As shown in Table 5, it is found that the activity becomes highest when the noble metal is supported on the alumina, and the heat resistance of the catalyst is excellent.
【００３２】[0032]
【表５】 [Table 5]
【００３３】［実施例５］加熱再生の効果を調べるた
め、以下の検討を行った。発熱体Ｇについて酢酸吸着試
験を行った。酢酸吸着試験は、２５０ｌの立方体のフッ
素樹脂製の容器の中に発熱体を置き、まず通電せずに吸
着させた。初期濃度は４０ｐｐｍとし、９０分後の濃度
を調べ、１回目の試験結果とした。次に、容器を開放し
空気を入れ換えた後、同じ実験を行い、２回目の試験結
果とした。さらに、その実験の後、容器を開放し、発熱
体の中心の外表面の温度が３５０℃となるよう１０分間
通電した。発熱体を室温近くまで冷却した後、もう一度
酢酸吸着試験を行い、再生後１回目の試験結果とした。
結果を表６に示す。表６に示すように、一度の実験以後
は酢酸吸着能力が落ちるが、再生により初期の吸着能力
に戻る。[Embodiment 5] In order to examine the effect of heat regeneration, the following examination was conducted. An acetic acid adsorption test was performed on the heating element G. In the acetic acid adsorption test, a heating element was placed in a 250 l cubic container made of fluororesin, and adsorption was performed without energization. The initial concentration was 40 ppm, the concentration after 90 minutes was examined, and the result was the first test. Next, after opening the container and replacing the air, the same experiment was conducted and the result of the second test was obtained. Further, after the experiment, the container was opened and electricity was supplied for 10 minutes so that the temperature of the outer surface at the center of the heating element was 350 ° C. After the heating element was cooled to near room temperature, the acetic acid adsorption test was conducted again, and the test result was the first time after regeneration.
The results are shown in Table 6. As shown in Table 6, the acetic acid adsorption capacity drops after one experiment, but returns to the initial adsorption capacity due to regeneration.
【００３４】[0034]
【表６】 [Table 6]
【００３５】［実施例６］脱臭体を被膜として形成する
とき、適当な基材が何かを選定するために、様々な基材
を用いて被膜の形成を行い、密着性を調べた。大きさ１
００ｍ×９０ｍｍ，厚さ１ｍｍの石英板、アルミニウム
板、ステンレス鋼板（ＳＵＳ４３０）をそれぞれ脱脂洗
浄した。これらの基材の片側にスラリーＧを塗布し、４
００℃にて焼成することにより被膜を形成した。なお、
被膜重量は１．０ｇとした。これらを４００℃で加熱
し、すぐに室温の水中に落下させる水中急冷試験を５回
繰り返し、被膜の剥離状況を調べた。結果を表７に示
す。表７に示すように、石英の基材を用いることによ
り、良好な耐熱衝撃性が得られる。[Example 6] When a deodorant was formed as a coating, various base materials were used to form the coating in order to select an appropriate base material, and the adhesion was examined. Size 1
A quartz plate, an aluminum plate, and a stainless steel plate (SUS430) having a size of 00 m × 90 mm and a thickness of 1 mm were degreased and washed. Apply Slurry G to one side of these substrates and
A film was formed by baking at 00 ° C. In addition,
The coating weight was 1.0 g. These were heated at 400 ° C. and immediately dropped in water at room temperature, and an underwater quenching test was repeated 5 times to examine the peeling state of the coating. The results are shown in Table 7. As shown in Table 7, good thermal shock resistance can be obtained by using a quartz base material.
【００３６】[0036]
【表７】 [Table 7]
【００３７】［実施例７］実施例２で作成したスラリー
Ｇにおいて、スラリー中のコロイダルシリカ水溶液を、
最終固形分中に含まれる無機バインダーの量が同じにな
るように、種々の無機バインダーに置き換えたスラリー
を調製し、同様に発熱体を作成した。これらの被膜の膜
硬度について調べるために、ＪＩＳＧ−３３２０の鉛筆
硬度試験を行った。また、それぞれの発熱体について、
実施例４で述べた酢酸酸化浄化試験を行い、１０分後の
残存率を求めた。結果を表８に示した。表８に示すよう
に、バインダーとしてアルミナゾルやベントナイトを用
いると被膜硬度が低下し、リチウムシリケートや水ガラ
スを用いると被膜硬度は向上するものの膜が多孔質とな
らず触媒活性が低下することがわかった。以上のよう
に、無機バインダーとしてシリカを用いることにより、
触媒活性を低下させることなく強固な被膜を形成するこ
とができる。[Example 7] In the slurry G prepared in Example 2, the colloidal silica aqueous solution in the slurry was changed to
A slurry in which various inorganic binders were substituted so that the amount of the inorganic binder contained in the final solid content was the same was prepared, and a heating element was similarly prepared. In order to investigate the film hardness of these films, a pencil hardness test of JISG-3320 was conducted. Also, for each heating element,
The acetic acid oxidation purification test described in Example 4 was performed to determine the residual rate after 10 minutes. The results are shown in Table 8. As shown in Table 8, it was found that when alumina sol or bentonite was used as the binder, the film hardness was reduced, and when lithium silicate or water glass was used, the film hardness was improved, but the film was not porous and the catalytic activity was decreased. It was As described above, by using silica as the inorganic binder,
A strong coating can be formed without lowering the catalytic activity.
【００３８】[0038]
【表８】 [Table 8]
【００３９】［実施例８］適切な無機バインダーが何か
を調べるため、以下の検討を行った。実施例２で作成し
たスラリーＧにおいて、コロイダルシリカ水溶液４００
ｇを加える代わりに、シリカ粉末８０ｇと水３２０ｇを
加えたスラリーを調製し、シリカ粉末をシリカ源とした
発熱体Ｐを作製した。なお、被膜重量および固形分中の
シリカの量は発熱体Ｇと同じである。これらの被膜の膜
硬度について調べるために、ＪＩＳＧ−３３２０の鉛筆
硬度試験を行った。結果を表９に示す。表９に示すよう
に、シリカ源としてコロイダルシリカを用いることによ
り強固な被膜が形成できる。Example 8 In order to find out what is a suitable inorganic binder, the following study was conducted. In the slurry G prepared in Example 2, the colloidal silica aqueous solution 400
Instead of adding g, a slurry was prepared by adding 80 g of silica powder and 320 g of water to prepare a heating element P using silica powder as a silica source. The coating weight and the amount of silica in the solid content are the same as those of the heating element G. In order to investigate the film hardness of these films, a pencil hardness test of JISG-3320 was conducted. The results are shown in Table 9. As shown in Table 9, a strong coating can be formed by using colloidal silica as a silica source.
【００４０】[0040]
【表９】 [Table 9]
【００４１】［実施例９］シリカの添加量と被膜密着性
との関係について調べるため、以下の検討を行った。実
施例２で調製したスラリーＧにおいて、スラリー中の全
固形分に対して、コロイダルシリカ水溶液をシリカに換
算して５〜６０ｗｔ％の間の種々の含有割合とし、シリ
カ増減分はアルミナを増減したスラリーを調製し、これ
を用いて被膜１．０ｇを形成した発熱体を作製した。こ
れらの発熱体について熱衝撃試験を行い、被膜の密着性
を調べた。熱衝撃試験は、石英管に内蔵した電気抵抗体
に通電し、被膜中央の表面温度を２５℃毎に設定し、そ
の温度で１０分間保持した後、室温水中に投下して被膜
の剥離の有無を調べ、剥離を起こさない最大温度を耐熱
衝撃温度とした。結果を表１０に示した。表１０より明
らかなように、シリカの含有割合が１０ｗｔ％以上４０
ｗｔ％以下で最も良好な密着性が得られ望ましい。Example 9 The following study was conducted to investigate the relationship between the amount of silica added and the coating adhesion. In the slurry G prepared in Example 2, the colloidal silica aqueous solution was converted into silica to have various content ratios of 5 to 60 wt% with respect to the total solid content in the slurry, and the silica increase / decrease increased or decreased the alumina. A slurry was prepared, and using this, a heating element having a coating film of 1.0 g was formed. A thermal shock test was performed on these heating elements to examine the adhesion of the coating. In the thermal shock test, the electric resistance built into the quartz tube was energized, the surface temperature at the center of the film was set at every 25 ° C, the temperature was maintained for 10 minutes, and then the film was dropped in room temperature water to remove the film. And the maximum temperature at which peeling did not occur was defined as the thermal shock resistance temperature. The results are shown in Table 10. As is clear from Table 10, the content ratio of silica is 10 wt% or more and 40
The best adhesion can be obtained at less than wt%, which is desirable.
【００４２】[0042]
【表１０】 [Table 10]
【００４３】[0043]
【発明の効果】以上のように本発明の脱臭体は、ＳｉＯ
2／Ａｌ2Ｏ3＝８以上のゼオライトを用いることによ
り、優れた耐酸性を得ることができる。また、悪臭物質
の１つであるメチルメルカプタンを効率的に除去でき、
しかも副生成物であるジメチルジサルファイドの生成を
抑制できる。また、貴金属をアルミナに担持させること
により優れた耐熱性を得ることができ、脱臭体外表面に
貴金属を偏在させることにより、優れた脱臭特性が得ら
れる。また、脱臭体の吸着能が飽和に達した時点で、脱
臭体を加熱したり、加熱された空気を脱臭体に接触させ
ることにより、触媒物質である貴金属を活性化し、脱臭
体に接触した空気中の臭気物質を脱臭するとともに、ゼ
オライトに吸着された臭気物質も貴金属により酸化分解
し、ゼオライトの吸着能力を再生することができる。ま
た、電気抵抗体を内蔵した石英またはガラス体の表面に
脱臭体を被膜として形成することにより、効果的に脱臭
を行うことができる。As described above, the deodorant body of the present invention is made of SiO
Excellent acid resistance can be obtained by using zeolite with 2 / Al 2 O 3 = 8 or more. In addition, methyl mercaptan, which is one of the malodorous substances, can be removed efficiently,
Moreover, it is possible to suppress the production of dimethyl disulfide, which is a by-product. Further, excellent heat resistance can be obtained by supporting the noble metal on alumina, and excellent deodorizing property can be obtained by unevenly distributing the noble metal on the outer surface of the deodorant body. In addition, when the adsorption capacity of the deodorant reaches saturation, the deodorant is heated or the heated air is brought into contact with the deodorant to activate the precious metal that is the catalyst substance, and the air contacting the deodorant is activated. It is possible to deodorize the odor substance therein, and also oxidize and decompose the odor substance adsorbed on the zeolite by the noble metal to regenerate the adsorption ability of the zeolite. Further, by forming a deodorant as a film on the surface of quartz or a glass body containing an electric resistor, it is possible to effectively deodorize.
【図１】本発明の実施例で用いた発熱体の構成を示す縦
断面図である。FIG. 1 is a vertical cross-sectional view showing the configuration of a heating element used in an example of the present invention.
１ ニクロム線 ２ 石英管 ３ 触媒被覆層 ４ 碍子 1 Nichrome wire 2 Quartz tube 3 Catalyst coating layer 4 Insulator
───────────────────────────────────────────────────── フロントページの続き (72)発明者 前田 利樹 大阪府東大阪市高井田本通３丁目22番地 松下冷機株式会社内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshiki Maeda 3-22, Takaidahondori, Higashiosaka, Osaka Prefecture
Claims (6)
オライト、アルミナおよび貴金属を含む脱臭体。1. A deodorant body containing zeolite, alumina and a noble metal having a molar ratio SiO 2 / Al 2 O 3 of 8 or more.
オライトと、貴金属を担持したアルミナを含む脱臭体。2. A deodorant body containing zeolite having a molar ratio SiO 2 / Al 2 O 3 of 8 or more and alumina carrying a noble metal.
オライトと、アルミナを含む成型体もしくは被膜の外表
面ないし外表面近傍に、貴金属を偏在させた脱臭体。3. A deodorant body in which a noble metal is unevenly distributed on the outer surface or near the outer surface of a molded body or a coating containing zeolite having a molar ratio SiO 2 / Al 2 O 3 of 8 or more and alumina.
体と、前記石英またはガラス体表面に形成された触媒被
覆層を具備し、前記触媒被覆層が、モル比ＳｉＯ2／Ａ
ｌ2Ｏ3が８以上のゼオライト、アルミナ、無機バインダ
ーおよび貴金属を含む発熱体。4. A quartz or glass body containing an electric resistor and a catalyst coating layer formed on the surface of the quartz or glass body, wherein the catalyst coating layer has a molar ratio of SiO 2 / A.
A heating element containing zeolite, alumina, an inorganic binder, and a noble metal in which l 2 O 3 is 8 or more.
記載の発熱体。5. The inorganic binder is silica.
The heating element described.
０ｗｔ％である請求項５記載の発熱体。6. The silica content of the catalyst coating layer is 10-4.
The heating element according to claim 5, which is 0 wt%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30918593A JP3521091B2 (en) | 1993-12-09 | 1993-12-09 | Deodorant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30918593A JP3521091B2 (en) | 1993-12-09 | 1993-12-09 | Deodorant |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07155365A true JPH07155365A (en) | 1995-06-20 |
| JP3521091B2 JP3521091B2 (en) | 2004-04-19 |
Family
ID=17989956
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30918593A Expired - Lifetime JP3521091B2 (en) | 1993-12-09 | 1993-12-09 | Deodorant |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3521091B2 (en) |
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1993
- 1993-12-09 JP JP30918593A patent/JP3521091B2/en not_active Expired - Lifetime
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| Publication number | Publication date |
|---|---|
| JP3521091B2 (en) | 2004-04-19 |
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